Have you looked at your blog on your phone lately? Mine's pretty illegible, I'm afraid to say.
I discovered this morning that Blogger has added some nice new mobile templates to its settings. They make your blog look a lot better—if also simpler and easier to read—on iPhones and other mobile devices. (Note that the regular version will be used on iPad, which I think makes sense.) And it's super easy to set up.
Go to the Email & Mobile tab of the Settings section of your blog in Blogger:
In the Show mobile template section at the top of the tab, click Yes. Click the blue Mobile Preview button to get a sample of what your blog will look like in mobile browsers:
Don't forget to click Save Settings at the bottom of the tab.
And then go check your blog in some mobile devices (sorry, mine are all iOS):
Did I mention I wrote a pretty good book on customizing Blogger? It's called Publishing a Blog with Blogger: Visual QuickProject Guide. You can buy it on Amazon and elsewhere.